
.banner {
    height: 500px;
}

.banner1 {
    background: url("../img/banner.jpg");
}

.banner2 {
    background: url("../img/banner2.jpg");
}

.banner3 {
    background: url("../img/banner3.jpg");
}

@media (max-width: 600px) {
    .banner {
        height: 230px;
    }

    .banner1 {
        background: url("../img/banner.jpg") center center no-repeat;
        background-size: cover;
    }

    .banner2 {
        background: url("../img/banner2.jpg") center center no-repeat;
        background-size: cover;
    }

    .banner3 {
        background: url("../img/banner3.jpg") center center no-repeat;
        background-size: cover;
    }
}


.card .card-text{
    height: 30px;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}



/*底部的样式*/
footer{
    font-size: 14px;
    background-color: #f5f5f5;
    padding-top: 50px;
    padding-bottom: 50px;

}
footer h4{
    font-size: 14px;
}